Hydraulic control device for automatic transmissions

Details Hydraulic control device for automatic transmissions Hydraulic control device for automatic transmissions

1997-09-02

1999-01-19

Wright, Dirk

Planetary gear transmission systems or components

Fluid drive or control of planetary gearing

Fluid controlled mechanical clutch or brake

477117, B60K 4106

Patent

active

058608869

ABSTRACT:
A hydraulic control device for automatic transmissions is disclosed. The control device of this invention includes a valve means, of which the valve spool is selectively actuated by a drive pressure, the spring force of a valve spring or a control pressure from the PCV, with the control pressure being used in event of an R-N-D shifting operation. The hydraulic control device thus slowly releases the front clutch pressure during an N-D shifting operation and quickly releases the front clutch pressure during an R-N-D shifting operation, thus smoothly performing the R-N-D shifting operation without generating any shifting shock.

REFERENCES:
patent: 4748870 (1988-06-01), Sugino et al.
patent: 5078028 (1992-01-01), Ishikawa et al.
patent: 5107723 (1992-04-01), Yamashita et al.
patent: 5655994 (1997-08-01), Jang et al.
patent: 5720694 (1998-02-01), Jang
patent: 5749802 (1998-05-01), Tamahashi et al.

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